"They serve the purpose of changing hydrogen into breathable oxygen, and they’re as necessary here as the air is, on Earth."
"But I still say……they’re flowers."
"If you like."
"Do you sell them?"
"I’m afraid not."
"But, maybe we could make a deal."
"What do you mean?"
"Oh, you see, you won’t have to send them anywhere. I’ll pay for them, and then, I’ll leave them here, for you."